Mid to late war generic litzen mounted on early type backings with lemon yellow signals piping. a bit odd IMHO.
Whatever its just an opinion.
I was referencing these when I made my post. I'm not sure of those are original or not but it was the only thing I could find.
Those are for an Official of the "einfacher Dienst", however I am not convinced that they are for the Feldpost, as they tend to be a lighter color than my FP boards.
I have 2 pairs very similar to your both obv and rev, though mine have the HV green in the litzen. The one set has the same yellow as oyurs and the other set is for a member of the Reichkriegsgericht
The bordo ones also have the same stitching. I have also seen a set with white nebenfarbe.